<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style type="text/css">
        h2 {
            color: red; font-size: 4em;
        }
        div {
            font-size: 2em;
            background-color:lightcoral;    /*背景颜色设置*/
            margin-bottom: 1px;
        }
    </style>
</head>
<body>
<h2>我在H2中</h2>
<div>我在div中</div>

<div>我在div中</div>
<div>我在div中</div>
<div>我在div中</div>
<div>我在div中</div>
<div>我在div中</div>
<div>我在div中</div>
<div>我在div中</div>
</body>
</html>